HP Compaq nc6400 review (Core Duo)

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System configurations:

Dell Latitude D620
Windows XP Professional; 2GHz Intel Core Duo T2500; 1,024MB DDR2 SDRAM PC4300 533MHz; Nvidia Quadro NVS 110M 256MB; Hitachi Travelstar 5K100 80GB 5,400rpm

HP Compaq nc6230
Windows XP Pro; 2GHz Intel Pentium M; 512MB DDR SDRAM 400MHz; ATI Mobility Radeon x300 64MB; Toshiba MK8026GAX 80GB 5,400rpm

HP Compaq nc6400
Windows XP Professional; 1.83GHz Intel Core Duo T2400; 512MB DDR2 SDRAM PC4300 667MHz; Intel Mobile i945GM Express 128MB; Fujitsu MHV2060BH 60GB 5,400rpm

Lenovo ThinkPad T60
Windows XP Professional; 2GHz Intel Core Duo T2500; 1,024MB DDR2 SDRAM PC5300 667MHz; ATI Mobilty Radeon X1400 512MB; Hitachi Travelstar 5K100 100GB 5,400rpm